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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09d624b661e5f68e61171253d7e4d324e6d83b2cac0b4806d4b7f1ef30b3c11' 
  AND token = 'mYsHYrHdxV8x9kaTDl+30rpvlrXX6oq6trugW9hlQVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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