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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4110ec1c0a26b58ec92da970b2d4eda74b2cfecea46a1cf1efd11e674ba4891' 
  AND token = '2ZPoPEt8Cu/QPiZ5foaHR4kCdGibh7QSobROaL+M3Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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