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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5e9ed322a521495021660339d9e110c7d5a6b5681543855af903aaeb604db6' 
  AND token = '3cSTvon9svbQpWmDe9GVOu2ojJkP8hl3TOgvD2//wBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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