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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444386c841b5bbd71cf7ea2b2a54e3c6026381c66b792654e07d89f6bbbea948' 
  AND token = 'BgdyWT5ii7ud2E8Idcvk1xnYkFWAzwJhl/QaYe8sCts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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