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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d950f46d515ad018daee2e43fd681093a48e3b409467e41a35704ad06e5531' 
  AND token = 'Y07Uv93crkuvRy0R8S3sY0+i/3DHA0mNQbHcrVYzglg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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