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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da5726fe13a549229c13cff9055a4cbaca69f1e6cdbc2c99d4c1c87faf6714d' 
  AND token = 'HcMHMpWLgUni7tq87SJG36qhYtHADHcpPn6gFN/2b8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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