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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950d78e25673ce3048084edb1047b3c1cc45da95e64d80720c76ab88975b2ffc' 
  AND token = '5NpVm4TkaOb13qevfkYPvyytiyJv21g9k1ToIUUuqtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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