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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7219967b08bb025a8cff42f73f060d9e6092a0fd8877b3c5fab1503bc3b97e5d' 
  AND token = '1+4qoD0+H84GNDF5+Oag+vwSw3btx+S9khnMIHyLCQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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