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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15225e172a22ae1d05361eb99ee49928fc42d7569a5735cc5bf472e511c989c' 
  AND token = '6G+D1WDZaqdf+B9RoWG6wk3XEPrGnd73W7JJImt3X/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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