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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cdbd97c3cf9c6ecba269f652c3039673a3e9419cdc1f7027c2c005146b28a8' 
  AND token = 'ycuEKOfffHJWm7l8YNwgOvNIbU1EMVsN9RsLAgFLWi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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