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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29de6a58a9a47ec3a79b9169c21461f9455669a0942361b9dfca7da55613895' 
  AND token = '1qJoqdQEuatW4/Nxm/+RrvRs8werX0mNPN5CuvlXTaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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