SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdda701915ef2182be7f52e4a04d846d0f90a93f5488fb2c87bf4e94c9da139' 
  AND token = '522DtbFS4vhLF6vJjQb70/gCrUKQgXy6GRFQUfXYPiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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