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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3802906015ac3f63fa9f4f6ff48586e8c3629dba0c3d483e55133736d96bd3' 
  AND token = 'i/whvSlbVEa8UaHnVxfF8PrpAwBBn54xqkiSgWkxDYM=' 
  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"
    }
  }
}