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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9f8918266cd51d69cc1b96c646f0211cef2dec578e89173ec35480a901d5ee' 
  AND token = 'AJm2aDpOPMox3Js1nsDwj7dd/nPh6+hz09CoW4o6psE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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