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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367a20937cc2fed62b28f20bf22ece36137b426ad688d84490d511812e202b9d' 
  AND token = 'wLFQh0eAHlBk6s3ffF9eJCcEjgsg7WDP3VjU0yg/ZtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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