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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe1aa0aaecdb92e8b294e7dc0ee92cac2153a3dc20afe76fb926743c5eb48b8' 
  AND token = 'o6Zuo+pK/HCMsLgNHZnH3s3PESjXemvtpfjBB+uAq60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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