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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d5239294305c1cdc9a8a383d691cd30646e84328e54aadb890b5c7552a2a95' 
  AND token = 'elvP+uumcRz9wS2iL/ZNBQTye0DtDhWqzvIgNxJePjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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