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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a593970590529444d5897b849ce078adbc00fea57ca84cb0a80f3fce8411d3' 
  AND token = 'L+WRv6xA46uGaRu5doc8hB4h8n8t8raZ/x236uGoA8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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