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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6988b9fce53e3cab92400784a08b78c6a5146235f4a3d89a0ea8f31539469f9' 
  AND token = 'GIMEGb/a9r26C0MZ4KEUzWTJjhbxtdX0uOWfCAL8Fq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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