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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76af4eda85549a04b49ec6c758d15c8fa875e36519cb0f793792468505eeebbc' 
  AND token = 'KQVTzo5MGKlPPYVCbmnL86O3Oic1Frmmz3S3ZjZe5f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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