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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb75e85659fc8c0d0f29474962250cb87f5ac5a4d1aed7794901cf7ee5fbf40' 
  AND token = '7kvNdED/sOlahY1CH7MK8Q6IYeg5a41x9fYP14WxqlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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