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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248b64832cc0a06ef8dace9ed3ea5aef28bdecbbef607401795885a4b75dbd8e' 
  AND token = '4yB2T3OCyyS49Q2c9UoVA+2jBJhQdhlK6oZ5zcFhZYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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