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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb798dcf79e1fc4d5cfc6acf87ca6f21c2a5e2e13a24241871f0988c26f545e' 
  AND token = 'aj8p+vxz8XwHqhuyFKfeTnycvkaLsTuS+dO3s35nKxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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