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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ba7dca0802224210ae527e9c6d5c4aa27d4c1103418c8e1242c57c8c7b80ee' 
  AND token = '/Agh+fi0apT7TW4GisZoVy8ydbakhyRs6nLGUsB7aNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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