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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9494d15c72e8b036b4d326ae8d24d407360812eaba58d85ab37044aa9c2a74e8' 
  AND token = 'xB7ect8cU3t+1LND3cm6Ak8+UOcCIdWwUBanhxo5w5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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