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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109237928d4ddf97b743ea2c680787fa35bfdcdf85c0ec8f38e8f1ca002ca300' 
  AND token = 'swMXEd2qKXwVsjP008fy/P8RElJ9xqmDqyw4q7cwRfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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