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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f10a748c9e6dfe66159ba17b54021f696123ab0301546d6f0489976de0b68f' 
  AND token = 'hRQA6lw4uCvpQdQZV1prIYeEIu7yL43xJs9HADE10zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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