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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7889db8587e7d45338b92f95d52cc3db95f8a4238189a902b179f72007d22155' 
  AND token = 's+RHO+uGC6I8s6DEByW44fmuJupfxt/L8x1y2KaI8uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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