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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bfb206449fa53c5e5091de8e39b4109407bb53609f47fec214896beb8f7580' 
  AND token = '5NZMtdA6QcxU9IX7Q4HZQkqi90TwTP3bBRnkGXbF6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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