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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1c24cc4a94f1ade8f1b55685d77e457862a3eda1b7d66b55cd8ad94c89440f' 
  AND token = 'KHaAz4ciZWAoHodXf56yHTgFKxnBCvzxqXAhA9mK1iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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