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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9537ade33df9ee7027d57cfab28aa90f25ba7763c6a6c37a615375b9e2f5830e' 
  AND token = 'HdO8+y5GnZWdFGiNUR0ygI5jXXO/y/EnO4plxUt0PQM=' 
  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"
    }
  }
}