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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f392a9b6b9f3083ce33dbf6a224b29c54db9ab0a4285883ac142c216204c40' 
  AND token = '+uCQreTvz1LzMtee8nvjPzuoh04lTeLkrawddp97FHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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