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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e789c3359e4be46a148289506ada31fb707a758713278ba70c39443c93d4da8' 
  AND token = 'Ro+dcasJ2Oz7IqPUJ7u3xU6m5R8YInybUC7wY5DaOnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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