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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8119a9a6215ba221706287ac097a9a48c454a78eb7cec5f14f231aa89cabcc80' 
  AND token = 'hwaOvKG0ZZwbvWqJWk9US2fvB9F6DwYpPZclpwe/smY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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