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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698a9d328ea6e2613af665fd0db0b73e7177de63241071a27ddb7b1d27d755c0' 
  AND token = 'HKIdcE85KFGdUwD96A5nnqW1m8U1Qm66joB50UIAwrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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