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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f593c5c98f023b760464a823f166cb29a73ab2092fac2884578bdac4daae659' 
  AND token = 'ygLv9rUt6LL25/rArB1B67gcgzUskUku36ea/N6gaLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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