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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1992b654244edbb884146d33913d14ea4f1054f4ccd6be68a67ae2a4457064' 
  AND token = 'De5OteA+GQmHZOnLUlakno9FVCO/+ckVaamgeevuZ54=' 
  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"
    }
  }
}