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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c371ed7ee418518552ff0c9be82e1a42afe867e42de23c6a09c0a1e55e5fc19' 
  AND token = 'fzOUhOxvW5gAmzaY7IimuRCLQ1lF94SB/P96TM001E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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