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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1a5f5be8dc8362bd48bab747127568b6da8bbdba986b5d77afb1c46213c3d7' 
  AND token = 'iOBjRlpstSq9ukKbmnWjPRKojH9YvNE+y74Z+0QIHKM=' 
  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"
    }
  }
}