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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c39b4d7f4ce41a1a209c98ae11a65aefb9ea0bbe74144489f03163944d71ac' 
  AND token = 'wP09/dvQlqVBIN2d1lJxa8/42Ll3TVZlFp+Y+mzOAf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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