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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8f6d72268181c8c108028ed9cdb97b9a8ec6d6f00fa1d59c43e6139f367f79' 
  AND token = '4AgMpB7A8UbcOt7Nz0JMeW/xtLX8MjGkey+Qd9uDyfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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