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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0b59472005333bee9571f9ca2e9d2c3412cfa34520fe466912ae27be040028' 
  AND token = 'F26aWFs1nN35UxfUYT5CBhCpJZTs5k1l8olMB6kPPY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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