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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3b8edcb8fa6654111635e615b346ecfcf970abaab9bd0a98a0ae5cdf132485' 
  AND token = 'a/t4I+A1Stj6UGxGtZP68LjZLjJcITWdHqpZ68B4Wr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}