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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7333215c4398da0f5ed1a9eef54775799acd1e7887de4e4489e3bf38616bacc1' 
  AND token = 'bterCjcamVP/BwU04LSYDy8qXcesewsh07Xkop+hM4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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