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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca6d20170803c136b1411b5457b3623a8a3435fe3f93498a8e39c7d6d3aa236' 
  AND token = 'QZM9A2gN1vNt6R8RDj/DJnMGcjS0JnTHcODlal7SZsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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