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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bb0348860d71ad2754cad4d3f6b606237e0dffbb596f3b28d39a428d4f0542' 
  AND token = 'WjXdGk2Dbsy+WDI+rJHuj+uvkv0rMVD5lnLElWY+RrE=' 
  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"
    }
  }
}