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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7136e642f2f7c08cc45f15ad9a880a74d8d859e65a9fc9640fd309116926ddb0' 
  AND token = 'qH5CzbygEU8lJzh705nH6xE6mIEeUF7ZlMAWS9bqlYU=' 
  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"
    }
  }
}