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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eea46ac6cfa10aa09fbe1a75f5aefdb258b4812cd4cc1a76a78c4352ee0245' 
  AND token = 'RFqjuO1rz2VD+MQFCaxs0a8p2W83IuOJs+E74vpi6dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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