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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fb8e38058448eb431b3bd7f76e787ea528b8657e12ac660bee6a558651135b' 
  AND token = 'SksK8Z/dIg/ZTwYLe1U883TANnCBgEQWje/SeXZU7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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