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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71cba32e4ffdad0c5ecb1e1a77ff4f3ff9d22e5db63189d8c304aa3bfed22a6' 
  AND token = 'fV80Vj4QUgbQ7NNCXYiR837seX9q/YNlwoOVa/+KvsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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