SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a80b6ec2d9e022bd9cc4dabfc8dffa9772d55a93efb361fb1d141a8c3507fbb' 
  AND token = 'sj3w6GrAGqyR2+RzA3FbLFTIRhi5vzAL2JF9ClvKAfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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