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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4033363bc36ea2c6bf93403c0bc2b6a930c81f175319e0355f582265bc6b6d28' 
  AND token = '3IKp12QoD/h/WwGNCjtC28DaN5MZEWjr+VdzmPWL6TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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