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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa22073af2fb63d812982840fb49c58493d59a8eb239f94f48e5ffc5c626474e' 
  AND token = 'HOex5wdXibQAf4kNaScXIbGAgdUzz83I6HA3AaU4+B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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